Which type of fuel nozzle requires the least maintenance?

The pintle nozzle is designed to be robust and relatively simple in construction, which contributes to its low maintenance requirements. Its design allows for a stable fuel flow and efficient atomization of the fuel without creating the complex interactions and wear that can be seen in other types of nozzles. The pintle design generally features fewer parts that could wear out and therefore tends to accumulate less debris, leading to less frequent need for cleaning or replacement.

In contrast, other nozzle types like single hole or multi-hole nozzles may have more complex geometries or multiple orifices, which can lead to more significant wear and tear over time, necessitating more frequent maintenance. Open nozzles might require more attention as well, depending upon their use and the conditions they operate under. This makes the pintle nozzle particularly advantageous for applications where reliability and low maintenance are paramount.